Americans spend billions of dollars each year on daily dietary supplements—vitamins, minerals, or herbs. Although supplements can help with good nutrition, many people take them without knowing enough to make sure they get the best results. Find out how much you know about dietary supplements by taking this quiz.
A product approved by the U.S. Pharmacopeial Convention (USP), NSF International, and ConsumerLab shows that the supplement has passed tests for:
In general, it's best to check with your doctor before taking any supplement. But this is especially true if you have a chronic health problem. If you have any of these conditions, talk you’re your doctor about taking a B12 or other supplement: